Generate random keystone users

Depends-On: https://gerrit.mcp.mirantis.com/#/c/44319/
Depends-On: https://gerrit.mcp.mirantis.com/#/c/45118/
Depends-On: https://gerrit.mcp.mirantis.com/#/c/45119/

Related-Prod: PROD-29868
Related-Prod: PROD-31315
(cherry picked from commit f5956c2f6151cc5d99659103f90641ea66eac44a)
(cherry picked from commit 70dd0f0587eb297fbefdea43837839c4983b8378)

Change-Id: I402be73437d5397224184a4fd71e2f6abae24db2
diff --git a/panko/server/cluster.yml b/panko/server/cluster.yml
index b6e87bb..3257a99 100644
--- a/panko/server/cluster.yml
+++ b/panko/server/cluster.yml
@@ -24,9 +24,13 @@
       role: ${_param:openstack_node_role}
       event_time_to_live: ${_param:panko_event_time_to_live}
       identity:
+        user: ${_param:keystone_panko_username}
+        password: ${_param:keystone_panko_password}
         host: ${_param:openstack_control_address}
         protocol: ${_param:cluster_internal_protocol}
       database:
+        user: ${_param:mysql_panko_username}
+        password: ${_param:mysql_panko_password}
         host: ${_param:openstack_database_address}
         x509:
           enabled: ${_param:openstack_mysql_x509_enabled}